Uncharted Waters © 1991 KOEI Corp.
North American release. Game developed in Japan. See the original for more information: "Daikoukai Jidai [Model KOE-QK]
Description from the back cover:
Climb aboard your flagship and set sail! As a young Portuguese captain, you are in search of fortune and fame. With your first mate at the helm, navigate the way to distant lands and legendary riches.
Port ho! Cast anchor in a new land and barter with stubborn merchants for exotic-spices and gems. Use profits to improve your fleet or face the dangers of the sea - pirates, storms and the mysteries of the deep. Win allies for Portugal, and the King will reward you grandly!